# -*- coding: utf-8 -*-

from selenium import webdriver
from time import sleep

driver = webdriver.Firefox()
driver.get('http://www.sucaijiayuan.com/api/demo.php?url=/demo/20141108-1/')

driver.switch_to.frame('iframe')

# js = "document.getElementById('txtBeginDate').removeAttribute('readonly')"  # 1.原生js，移除屬性
# js 
 
= "$('input[id=txtBeginDate]').removeAttr('readonly')"  # 2.jQuery，移除屬性
# js = "$('input[id=txtBeginDate]').attr('readonly',false)"  # 3.jQuery，設定為false
js = "$('input[id=txtBeginDate]').attr('readonly','')"  # 4.jQuery，設定為空（同3）

driver.execute_script(js)

driver.find_element_by_id('txtBeginDate').send_keys('2016-08-24'
 
)
sleep(2)
print driver.find_element_by_id('txtBeginDate').get_attribute('value')

driver.quit()